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Capital Stock and Changes in Capital Accounts (Details)
 12 Months Ended
Apr. 30, 2022
Vote
shares
Class A [Member]  
Common Stock [Abstract]  
Class A Common shares into which each share of Class B Common Stock is convertible (in shares) | shares 1
Percentage of the Board of Directors elected by Class A common stockholders 30.00%
Number of votes to which each share of common stock is entitled 0.1
Class B [Member]  
Common Stock [Abstract]  
Number of votes to which each share of common stock is entitled 1